What kind of a puzzle is this? Are there others like it?  Our
customers ask this question all the time. Serious puzzle collectors who own Jerry
Slocums books about mechanical puzzles can quickly answer these questions by looking
at his Mechanical Puzzle Classification and Taxonomy. Now you can too.

A mechanical puzzle is a self-contained object, composed
of one or more parts, which involves a problem for one person to solve by manipulation
using logic, reasoning, insight, luck, and/or dexterity. - Jerry Slocum